Diaphragm for talking-machines.



P. WEBER.

DIAPHRAGM FOR TALKING MACHINES.

APPLICATION FILED r113. 29, 1907.

1,056,475, Patented Mar. 18, 1913.

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DIAPHRAGM FOR TALKING MACHINES.

APPLIOATION mum 118.28, 1907.

' 1,056,475. Patented Mar. 18,1913.

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DIAPHRAGM FOR TALKING MACHINES.

APPLIOATIOH FILED FEB. 28, 1907.

1,056,475, Patented Mar. 18, 1913.

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PETER WEBER, OF ORANGE, NEW JERSEY, ASSIGNOR,-BY MESNE ASSIGNMENTS, TO

THOMAS A. EDISON, INCORPORATED, OF WEST ORANGE, NEW JERSEY, A CORPORA- TION .01 NEW 'JEEsEY.

DIAPHRAGM FOR TALKING-MACHINES.

Application filed February 28, 1907.

Specification of Letters Patent.

Patented Mar. 18, 1913.

Serial No. 359,891.

To all whom 1' i may concern:

Be it known that I, PETER \VEBER, a citizen of the United States, residing at Orange, county of Essex, and State of New Jersey,

, have invented new and useful Improvements in Diaphragms for 'lalking-Machines, of which the following is a description.

My invention relates to an improved diaphragm for phonographs or other talking machines, and my object is to provide a wry simple, cheap and effective diaphragm for the purpose, by'means of which superior reproduction can be obtained.

It is now recognized that to secure the best results with a symmetrical diaphragm, the latter should vibrate as nearly as a whole as possible, and to this end the diaphragm should be comparatively rigid or stiff for its greater part, its rigidity preferably increasing toward the center. To se-' cure this object it has been heretofore proposed to construct a diaphragm of a series of disks cemented together, but such a construction is expensive, the disks are likely to work loose, and the diaphragm is undulyheavy, so that it does not respond aeof concentric shallow depressions, which are arranged nearer togetheintoward the center, but such an arrangement is undesirable, for the reason that the diaphragm is provided with elatively extensive fiat portions in whicli'fidependent vibration may take place. On the other hand, if the shallow depressions are arranged soas to occupy the entire surface of the diaphragm, its rigidity would be substantially the same throughout, and hence, the best results would not be obtained.

VV'th my improved diaphragm I secure rigidity of practically its entire surface,,except at the outer edge where it is clamped in place and at the center where connection is made with the stylus, and at the same time I obtain graduall increased rigidity toward the center witliout increasing the weight, so that the diaphragm is extremely sensitive and responsive to the record or sound vibrations.

To this end the invention consists of making the diaphra m of a disk of extremely thin metal, pre erably hard rolled copper,

by indentations extending transversely with respect to the corrugations or grooves, or radially with respect to the diaphragm, and my invention therefore comprises diaphragms embodying this feature.

In order that the invention'may be better understood attention is directed to the acv companying drawing in which Figure 1 is .a plan -view on an enlarged scale of the preferred form of diaphragm; Fig. 2 is.a section on line 22 of Fig. 1, the thickness of the diaphragm being exto l and 2 respectively of a modified form of diaphragm, and Figs. 5 and 6 are similar views of a second modification.

Referring to Figs. 1 and 2 the diaphragm 1 is formed of a disk preferably of hard rolled sheet copper, about .0025 of an inch in thickness. The outer edge of the diaphragm is left flat to permit it to be clamped in place and-to offer a suilicient space in which vibration may take place. The main portion of the diaphragm is formed with a plurality of concentric depressions 2, fourof which are shown and which are of progressively increasing depth, so as to provide for gradually increased rigidity, two of said do pressions being located within a distance of substantially one-half of the radius of said diaphragm from the center of said diaphragm. These depressions are immedi ately adjacent, so that in cross-section the diaphragm presents a wave-like line, as shown. By making the depressions immediately adjacent to one another, no flat portions are presented in the body of the diaphragm, in which independent vibration can take place. The central portion 3 is left flat,.as shown, to provide a space for th aggerated; Figs. 3 and 4 are views similar The diaphragm of Figs. 3'and 4 is exactly similar to that of Figs. 1 and 2 except that the depressions 4 are lacking and the diaphragm is formed near its periphery with two small concentric grooves 5 and 6 con-- nected by radial indentations 7. The diaphragm of Figs. 5 and 6 is exactly the same as that of Figs. 1 and 2 except that the indentations 4 are absent.

Having now described mv invention, What I claim as new and desire to secure by Letters Patent, is as follows:

1. An im roved diaphragm comprising a disk, provi ed for its greater part wlth closely arranged concentric depressions or in a distance 0 grooves of graduall increasing depth toward the center, a p urality of said depressions or grooves being located within a distance of substantially one half the radius of said disk from the center of said disk, substaitially as and for the purposes'set forth.

2. An improved diaphragm comprising a metallic disk provided for its greater part with concentric depressions adjacent to' one another and of gradually increasing depth toward the center, a plurality of said depressions being located within a distance of substantially one half the radius of said disk from the center of'said disk substantially as and for the purposes set forth.

3. An improved diaphragm comprising a disk formed over its greater part with a series of adjacent concentric depressions of gradually increasing de th toward the center, a plurality of. said e re'ssions being located within a distance 0- substantially one half theradius of said disk from the center of said disk, substantially as set forth.

4. An improved diaphragm, comprising a disk having a flat outer portion, and a main portion, consisting of a series of. concentricadjacent depressions of gradually increasing I depth toward the center, a plurality of said depressions being located withsubstantially one half the .radius of disk from the center of said disk, substantially as and for the purposes set forth.

5. A circular diaphragm provided with concentric-depressions of increasing depth toward-the center and indentations extend ing transversely thereto, a plurality of said depressions being located within a distance of substantially one half the radius of said diaphragm from the center of said diaphragm, substantially as set forth.

6. A diaphragm provided with concentric corrugations so closely arranged as to leave substantially no flat portions in the body of the diaphragm, and indentations extending transversely thereto and intersecting the same, substantially as set forth.

7. A diaphragm provided with concentric corrugations so closely arranged as to leave substantially no flat portions in the body of the diaphragm, and radial stiffening means crossing the concentric corrugations, substantially as set forth.

8. A diaphragm provided with concentric and radial stiffening means, both closely arran ed and covering substantially the whole sur ace of the diaphragm except a'central portion and a narrow annulus at the extreme edge, the said radial means extending across some of the concentric means, substantially as set forth.

9. A diaphragm provided at its central portion with a plurality of concentric stiffening means adjacent one another and also provided with radial stiffening means extending substantially to the. periphery of said diaphragm, the said concentric and radial stiffening means being so arranged as to leave substantially no fiat portions in the body of the diaphragm, substantially as set forth.

10. A diaphragm provided at its central portion and adjacent its periphery with concentric stiffening means and also provided with radial stifiening means extending between said central and peripheral stiffening means, the said means being so arranged as to leave substantially no flat portions in the body of the diaphragm, substantially as set forth.

This specification signed and witnessed this 26 day of February 1907.

PETER WEBER.

Witnesses: DELOS HOLDEN, FRANK D. LEWIS.

Copies of this patent may be obtained for five cents each, hy addressing the Commissioner of Patents.

' Washington, D. O. 

